ScienceCLASS 8CBSE
answered 28 Mar 2026Fuel efficiency is determined by its calorific value, which is the amount of heat energy produced on the complete combustion of 1 kg of fuel. The calorific value of a fuel is expressed in kJ/kg.
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Watchglass containing petrol will catch fire first because petrol is a highly combustible liquid, and its calorific value is
45.8 MJ/kg. This is very less when compared to milk or mustard oil.